The transversal phase consists of a single visit in which all socio-demographic and clinical characteristics of patients will be collected; during this visit patients will receive the NEI-VFQ 25 and the GSS questionnaires for measuring QoL (they have be filled in by the patient himself). For newly diagnosed patients, data collected during this visit will be consider as baseline, then they will enter in the longitudinal phase and will underwent two subsequent visits, the first one after about 6 months from baseline and the second one after a further 6 months (12 months from baseline). During the two subsequent visits the same data as the baseline will be collected, excluding for the socio-demographic data.